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A nine-volt
battery, the most common of which (and the one referred to here unless
otherwise stated) is designated a PP3 battery, is shaped as a rounded
rectangular prism. 9-volt batteries are commonly used in pocket transistor
radios, smoke detectors, carbon monoxide alarms, guitar effect units, and
radio-controlled vehicle controllers. They are also used as backup power to
keep the time in digital clocks and alarm clocks.

Nine-volt alkaline
batteries are constructed of six individual 1.5V LR61 cells enclosed in a
wrapper. These cells are slightly smaller than standard LR8D425 AAAA cells and
can be used in their place for some devices, even though they are 3.5 mm
shorter.